Question

Which processes produce the carbon dioxide from the original glucose molecule? How many does each produce?

a) Glycolysis - 2 CO₂
b) Krebs cycle - 4 CO₂
c) Electron transport chain - 0 CO₂
d) a and b are correct

Answer 1

The Krebs cycle, not glycolysis, is responsible for producing carbon dioxide from glucose, releasing four CO2 molecules per glucose molecule. The correct answer is d. a and b are correct.

Step-by-step explanation:

The processes that produce carbon dioxide from the original glucose molecule are glycolysis and the Krebs cycle. Glycolysis does not actually produce carbon dioxide; it generates pyruvate that enters the Krebs cycle. During the Krebs cycle, for each acetyl CoA molecule that enters the cycle, two molecules of carbon dioxide are released. Since two acetyl CoA molecules are produced from one glucose molecule, this amounts to four CO2 molecules released per glucose molecule. Therefore, the correct answer is d. a and b are correct.